This is my first experience with fiber-optics, I was shooting at a fairly dark indoor range and the front sight was an improvement, and I'm 57 years old, I've had Lasik, wear glasses to shoot , and am left handed- right eye dominant.
As far as a range report I shot 300 rounds, all my reloads, Rem. 115 grain fmj, Rem. 124 grain jhp, and Rem. G.S. 124 grain. All rounds were about 1050 fps. The only gun that I shot this good first time out was a HK P7M8, I actually think I shot the Shadow better. I left the range with a big grin!